Abstract
This study aims to investigate the effects of cold and salicylic acid (SA) priming on osmolytes accumulation in wheat leaves under freezing stress and its underlying physiological mechanism. The results showed that cold and SA priming treatment significantly enhanced sucrose and free proline contents as compared with non-priming treatment under freezing, resulting in increased leaf water potential, reduced cell death and boosted freezing tolerance. Cold and SA priming-induced free proline accumulation under freezing not only depended on promoting its synthesis, but also on inhibiting its degradation. Interestingly, the synthesis and hydrolysis of sucrose were both increased by cold and SA priming treatment under freezing. Besides, cold and SA priming up-regulated the catabolism of glucose and the assimilation of ammonia as compared with non-priming treatment under freezing stress. Findings of the present study suggested that cold and SA priming could simultaneously promote-free proline and sucrose accumulation in wheat leaves by coordinating carbon and nitrogen metabolism under freezing conditions, and then conferring tolerance to freezing stress. These findings could provide a new insight into the mechanisms by which cold and SA priming enhanced freezing tolerance in wheat.
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Acknowledgements
This study was supported by the National Key Research and Development Program of China (2017YFD0300205, 2018YFD0300800), the National Natural Science Foundation of China (31771693, U1803235), Jiangsu Provincial Key Research and Development Program (BE2018362, BE2020319), the Fundamental Research Funds for the Central Universities (KYZ201807), the China Agriculture Research System (CARS-03), China Postdoctoral Science Foundation (2021M692721), and Jiangsu Collaborative Innovation Center for Modern Crop Production (JCIC-MCP), and the 111 Project (B16026).
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WW, XW and DJ conceived and designed research. WW, ZL and MH conducted experiments. JC, QZ and ZH guided experiments. WW and AK wrote the manuscript. All authors read and approved the manuscript.
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Wang, W., Wang, X., Lv, Z. et al. Effects of Cold and Salicylic Acid Priming on Free Proline and Sucrose Accumulation in Winter Wheat Under Freezing Stress. J Plant Growth Regul 41, 2171–2184 (2022). https://doi.org/10.1007/s00344-021-10412-4
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DOI: https://doi.org/10.1007/s00344-021-10412-4